4-metachlorophenylamino-1-anthra-n-methylpyridon.



ME ES PATENT @FFTQE OSKAR UNGER, OF LEVERKUSEN, AND PAUL THOMLASOHEWSKI, OF VOHWINKEL, GERMANY, ASSIGNORS TO FARBENFABRIKEN VORM, FRIEDR BAYER & GO., 015' ELBERFELID, GERMANY, A CORPORATION OF GERMANY.

' 4-ME'1ACHLOROPHEN YIiAMINO- l-ANTHRA-N-METIEYLPYRIDON.

Specification of Letters Patent. Patented June 13, 1911.

' No Drawing. Original application filed October 21, 1910, Serial No. 588,348. Divided and this application filed March 10, 1911.

Serial No. 613,842.

don, of which the following is a specification.

The present application which is a divisional application from our application Serial No. 588,348 relates to the manufacture and production of a specific new red wool dyestufi which is obtained by treating 4 meta chlorophenylaminoanthrapyridon with sulfonating agents in such a way that two sulfonic groups are introduced into the molecule.

In order to illustrate the new process more fully the following example is given, the parts being by 'weight: 1 part of 4t-metachlorophenylamino-l-anthra-n methylpyridon (obtainable from bromoanthra-nmethylpyridon and meta-chloroanilin) is sulfonated with 10 parts of fuming sulfuric acid (10 per cent. S0,) at a temperature of 2030 C. until a test portion is soluble in water. The mixture is then poured into (30 parts of water. The dye which is the disulfonic acid separates after a short'time in the shape of Vermilion red crystals which are filtered off, washed with a small quantity of water to remove the adhering acid and converted with the necessary quantity of caustic soda lye into the dark red sodium salt. The dye dissolves in concentrated sulfuric acid with a bluish-red color which on addition of boric acid turns yellowish-red showing a strong orange fluorescence.

The new colorin matter dyes wool from acid baths in brig t scarlet shades,-which are very fast.

We claim:

The herein-described 4.-meta-chlorophenylamino 1 anthra-n-methyl yfidon disulfonic acid, which is after being dried and pulverized in the shapeofi its sodium salt a dark red powder soluble in concentrated sulfuric acid with a bluish-red color which on addition of boric acid turns yellowish-red showing a strong orange fluorescence; dyeing wool from acid baths bright scarlet shades, substantially as described.

In testimony whereot we have hereunto set ourv hands in the presence of two subscribing witnesses.

' OSKAR UNGER.

PAUL 'IHOMASCHEWSKI.

[1.. s.] p Witnesses CHAs. J. \Vnror-rr, ALFRED HENKEL. 

